What happens after organic molecules, such as carbohydrates, proteins, and lipids, are consumed? a. they are broken down into simpler molecules by the digestive system so they can be absorbed into the bloodstream. b. they are passively transported by osmosis directly into the bloodstream. c. they enter directly into the lungs where they react with oxygen during cellular respiration. d. they are entirely converted into urine and feces, so they can be eliminated from the body.